<template>
  <view>
        <view class="uni-title uni-common-pl">地区选择器</view>
        <view class="uni-list">
            <view class="uni-list-cell">
                <view class="uni-list-cell-left">
                    当前选择
                </view>
                <view class="uni-list-cell-db">
                    <picker @change="bindPickerChange" :value="index" :range="array">
                        <view class="uni-input">{{array[index]}}</view>
                    </picker>
                </view>
            </view>
        </view>
        <view class="uni-title uni-common-pl">时间选择器</view>
        <view class="uni-list">
            <view class="uni-list-cell">
                <view class="uni-list-cell-left">
                    当前选择
                </view>
                <view class="uni-list-cell-db">
                    <picker mode="time" :value="time" start="09:01" end="21:01" @change="bindTimeChange">
                        <view class="uni-input">{{time}}</view>
                    </picker>
                </view>
            </view>
        </view>
        <view class="uni-title uni-common-pl">日期选择器</view>
        <view class="uni-list">
            <view class="uni-list-cell">
                <view class="uni-list-cell-left">
                    当前选择
                </view>
                <view class="uni-list-cell-db">
                    <picker mode="date" :value="date" :start="startDate" :end="endDate" @change="bindDateChange">
                        <view class="uni-input">{{date}}</view>
                    </picker>
                </view>
            </view>
        </view>
  </view>
</template>
<script>
  export default {
    data() {
        const currentDate = this.getDate({
            format: true
        })
        return {
            title: 'picker',
            array: ['中国', '美国', '巴西', '日本'],
            index: 0,
            date: currentDate,
            time: '12:01'
        }
    },
    computed: {
        startDate() {
            return this.getDate('start');
        },
        endDate() {
            return this.getDate('end');
        }
    },
    methods: {
        bindPickerChange: function(e) {
            console.log('picker发送选择改变，携带值为', e.target.value)
            this.index = e.target.value
        },
        bindDateChange: function(e) {
            this.date = e.target.value
        },
        bindTimeChange: function(e) {
            this.time = e.target.value
        },
        getDate(type) {
            const date = new Date();
            let year = date.getFullYear();
            let month = date.getMonth() + 1;
            let day = date.getDate();
            if (type === 'start') {
                year = year - 60;
            } else if (type === 'end') {
                year = year + 2;
            }
            month = month > 9 ? month : '0' + month;;
            day = day > 9 ? day : '0' + day;
            return `${year}-${month}-${day}`;
        }
    }
}
</script>